• https://vidwan.inflibnet.ac.in/
• https://ugcmoocs.inflibnet.ac.in/ugcmoocs/
• https://swayam.gov.in/
• https://epgp.inflibnet.ac.in/
• https://cec.nic.in/cec/
• https://swayamprabha.gov.in/
• https://shodhganga.inflibnet.ac.in/
• https://www.pdfdrive.com/
• https://www.free-ebooks.net/
• https://www.slideshare.net/
• https://www.openacessjournals.com/
• https://journals.sagepub.com/home/sgo
• https://pdfbooks.co.za/
• https://openlibrary.org/